Jeffrey Lord, who formerly served as a Ronald Reagan administration staffer, had been one of CNN's best-known commentators

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CNN commentator Jeffrey Lord has been bounced from the network after tweeting a Nazi salute.

CNN cut ties Thursday with conservative commentator Jeffrey Lord after he tweeted a Nazi salute at a critic.

A network spokesperson confirmed that Lord was no longer with the network and said "Nazi salutes are indefensible." The statement came hours after Lord tweeted the Nazi slogan "Sieg Heil!" at the head of a liberal advocacy group, Media Matters for America.

Retained by CNN in August 2015, Lord was an indefatigable on-air supporter of Donald Trump throughout his candidacy and since his election. A contributor to the conservative magazine The American Spectator, Lord is a former aide to Jack Kemp and Ronald Reagan.

He had repeatedly clashed with Media Matters president Angelo Carusone, whose group condemned CNN for employing him as a commentator

Following a harsh exchange of tweets with Carusone earlier this week, Lord posted an article for The American Spectator on Thursday morning, calling Carusone's group the "Media Matters Fascists" and casting them as "anti-free speech bigots who, in typical fascist style, make it their mission to shut down speech they don't like."

During the day, the Twitter sparring resumed, with Lord finally responding to Carusone with the tweet: "Sieg Heil!"

During his presence on CNN's airwaves Lord had frequently riled CNN hosts including Anderson Cooper and Don Lemon, fellow commentators, and viewers with many of his statements. During Super Tuesday election night coverage in March 2016, he argued that the KKK was a left-wing organization because of Democrats' support of it many decades before. In April, he called President Donald Trump the "Martin Luther King" of health care.